Sendmux

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Sendmux gives AI agents their own email inbox and a controlled way to send mail. Each agent can have a dedicated mailbox, read threads, handle attachments, send replies, and react to new messages through webhooks or Server-Sent Events. For teams building agents that need real email in production, that means fewer custom glue scripts and fewer fragile Gmail-style workarounds. Outbound email can run through Gmail OAuth, Outlook OAuth, SMTP providers, or managed Amazon SES. Teams can spread sending across providers with weighted routing, sender-domain routing, health checks, failover, and quotas by second, minute, hour, or day. That matters when one provider is not enough, or when customers already have approved sending infrastructure they want to keep using. Sendmux also gives developers the practical pieces around the inbox: Mailbox, Sending, and Management APIs, OpenAPI docs, SDKs for TypeScript, Python, Go, PHP, and Ruby, the sendmux CLI, MCP tools, and official Sendmux Skills for agent workflows. It is built for AI agent products, automation agencies, platform builders, support agents, scheduling agents, ops workflows, and controlled BYO-provider outbound email setups. Pricing is usage-based, with no per-seat or per-mailbox fees.